LDAP Attribute Profile (saml-profiles-saml2.0)

Can someone decode this sentence for me?

> For all other LDAP syntaxes, the attribute value is encoded, as the  
> content of the <AttributeValue>
> element, by base64-encoding [RFC2045] the encompassing ASN.1 OCTET  
> STRING-encoded LDAP
> attribute value.

If I have a jpegPhoto (0.9.2342.19200300.100.1.60), for example, is  
it the binary jpeg data that is base64 encoded or is there some ASN.1  
wrapper around that? It's the word encompassing that has me confused.

Thanks,

-Greg